I agree it should be user definable. The reason I didn't do that here is because it requires a change to the API. I started to put another icon out to the side, but my experience is that clicking on a primary field (like a user id) is more intuitive and more space efficient. If an option for this was to be passed into DataController.__init__, what would be a good name for it? I think link_field or link_column. So would look like link_field="UserId".
Randall
